Portable drilling apparatus.



w. H. UIFEENDALL. POR-TABLE DRILLIG APPARATUS. APPLICATION FfLlDV DEC. ih 1916.-

Mmmm@ DEG. 4, 1917?.

W .ff/11411111111 iALTER. H. DIFFENDALL, OF HAGEBSTOWN, MARYLAND.

PORTABLE DBILLING APPARATUS. y I

amas. g

To all 'whom it may concern.'

Be it' known that I DALL, acitizen of the nited States, reslding at Hagerstown, in the county of Washington and State of Maifyland, have invented certain new and use ul Improvements in Portable Drilling A paratus; and I hereby l declare'that the fol owing is a full, clear,

J This inventionis a nove A apparatus and combines a and exact description thereof, reference being had to the accompanying drawings, which form part of this ecication.`

ortable drilling me carrying a preferably pneumatic or iuid pressure i adjustably mounted thereon, and a pneumatic or fluid operated work clam or presser for holding the drill to its wor j The drilln alpparatus is particularly designed for ing, counter-sinking, or reamin holes and sockets in metal, and is especia y adapted for operating on metal flanges and sheets; and saves handlin ma terial and time as it can be readily adjusted to drill successive holes in an ob'ect without stopping the drill; and can e used in almost any position either of the object or the apparatus, and it does not prevent other work, such as chipping, beveling or other drilling being performed on another part Iof the object at the same time. l

I will explain the invention as embodied in the apparatus illustrated in the accomsection o n the line to operate a tool 1a ofany desired kind. The drill casing 1 is adjustably attached to a supporting frame or bar 2 of Fig. 1 by means of a clamp member 3, which is provided on its rear side with a longitudinal channel 3 adapted to fit the bar 2, so that Specification of Letters Patent. l

WALTER H. Duran member can be adjusted longitudinally of said bar. Said clamp member is provided on its front side with a projecting bracket ortion 3b adapted to support the lower en of the drilLcasing, which may be rigidly fastened to the member 3 by means of U-boltsfd which embrace the lower portion of .the drill casing and extend through perforated ears 3 on the upper and lower sides of4 the .clamp member 3 ,above and below the frame 2, Vand are engaged by nuts 4. The drill casing may be steadied in position on the clamp member 3 by means of a rod 6 having its upper end engaged with the upper part of the drill casing and its lower end engaged withl an ear 3 on thel clamp member 3, and secured thereto byA means of nuts 6% 'Binding stra s 5 are strung on bolts 4, at the rear si e of the frame 2, so that when nuts 4 areA tightened said straps 5 securely fasten the clamp member and drill casing to the frame 2. B loosening nuts 4a the member 3 and dri casing can be adjusted longitudinally of the frame.

As stated the drill ma be of any suitable construction and may electric or iiuid operated; a pneumatic drill of known type Patenten nea.. a, aait. l application mea December 1i, 191e. aerial no. isazic.

A the clamp being shown and the drilling tool 1 ex tends parallel with the frame 2 and operates practically at right angles to the main body of the drill casing. l

To the other extremity of the frame 2 and disposed in the same axial plane as the drilling tool is a pneumatic work clamp or presser device; comprising an outer cylinder 8 which is closed at its rear end and ina be provided with a threaded stud 8" exten v j ing through an aperture in the end 2 of the frame 2 (which end stands at right angles to the main portion of the frame) and is secured by a nut 8". Within cylinder 8 is a piston 9, of Fig. 4, which when in retracted position practically fills the cylin-l der. Said piston is provided with a packing 9aL adjacent its inner end, and is guided ina packing and stop ring 8, screwed into the outer end of the cylinder 8. Said piston is adapted to be projected ,outside the cylinder to engage the work and force same against the drilling tool. The piston lis preferably hollow and has anV openin 9 ins outer end opposite the tool or dri 1".

Air or Huid may be admitted into the rear end of the cylinder 8, to project the piston 9, by means of a pipe 10 which may communicate with the pipe 12 which supplies air or fluid to the drill o erating mechanism in the usual manner. aid pipe 10 is provided with a 3 way cock 11 that can be opened and closed manually to admit air and cause the piston to clamp the work, and` A clearance or limiting bar 7 is fastenedto the frame 2 and projects between the tool and the piston so as to limit the extent or depth of the cut made by the tool when it it not desired to' drill entirely through the object. The limiting bar 7 may be adjustably attached to bar 2 by any suitable means; as by bolts 7 1 adapted to engage any of a se-l ries of holes 7 in the bar and secured bynuts 7b. The limiting bar 7 can be adjusted so that, the depth oi the hole bored by the tool can be regulated; or said bar may be detached andthe apparatus used to bore holes, or for countersinkmg objects, etc., up to any Width or thickness equal to the distance between the point of the tool and the piston when the drill isadjusted to the extremev outer endof the frame 2.l *l @parution i 4' When used lfor drilling holes inI metal plates, for example, the apparatus may be adjusted Vover the edge of the plate indicated at ,P in Fig. 1,' until the tool lis opposite the point where it is desired to drill the plate;` air is then admitted into the cylinder 8 and .piston 9 is projected bringing the plate under yielding pressure against the tool 1a y and causing it to follow up as the tool bores f until a hole of the desired depth is formed,

or theplate'is entirely perforated; the open- 'ing'9c'in the piston permits` the tool to "entirely perforate the plat'e Without injury to the piston.v The piston will hold the work wup against the tool withthe desired uniform pressure at vall times, so that the tool Will operate most eiiciently. I

The apparatus is readily portable; can be used 4for drilling various objects; and can be conveniently used in almost any position where an ordinary drill might be used; also that other kinds of tools lieu of the drill.

What I claim is: f 1. In an apparatus of the fied the combination of a frame, a tool opermight be used in character speci! Lamme .tached to said frame intermediate the tool and the clamp to limit the depth of the cut made by the tool. 2. In combination a supporting frame having a laterally projecting return bend intermediate its ends, a power actuatedtooloperating member attached to said frame at one side of said return bend, and ad'ustable longitudinally of the bar, and a fluid-actuated Work clamp attached to said frame at the opposite side of the bend.

8. In a drilling apparatus the combination of a bar, a pneumatic drill adjustably mounted on said bar, and a pneumatic work clamp also mounted on said bar in constant axial alinement with the drilling tool, said drill and clamp being relatively adjustable on said bar. 4

4. In combination a frame having a lateral offset, a support attached to said frame at one side of saidoiiset and adjustable to or from the oifset, a tool-operating member e mounted on said support, and Work clamping means attached to said frame at the side of the said offset opposite the tool-operating member. A

5. In adrilling ap aratus, the combination of a supporting rame havin va lateral bend intermediate its ends; a ui -actuated tool-operating apparatus adj ustably attached to said frame at one side of said bend "and earryin a tool disposed parallel with and longitu inally of the` frame;l and va Huid ac' ltilated Work clamp attachedto .said frame at the sideof the bend opposite the tool scribed.

6. A` drilling apparatus comprising asup-I- porting b'ar, a sup orting member mounted uponand ad' bar, means' ldor --detacha ly attaching the member to the bar, a tool casing detachably `attached to said member and having a tool operating apparatus, .l substantially 'as ustab e lon itudinally of said operating in a plane parallel with the bar;

and a fluid operated work clamp also atbend, a support adjustably attached to said i.;

bar at one side of said bend, a tool operating member mounted on said support, a work clamping device attached to said frame at miem@ the side of said offset opposite the tool opermy own, l' Six my signature in presence ef ating member, and a limiting stop attached two Witnesses. t0 said frame intermediate the tool and the WALTER H. UFFENDLL. clamping device to limit the depth of the Witnesses:

5 cut made by the tool. G. I. CHARMUN,

1n testimonythat I claim the foregoing as W. T. FERINGER. 

